Rep Power: 0

So I drove my 2004 Civic DX for the first time in at least a week (I've been driving my SUV since we've had snow and bad weather) and I didn't get far down the road before the CEL light came on. I pulled codes and had three of them. P0325, P0219, and 23-01. I cleared the codes and P0325 came back pretty quickly. I'm going to check the voltage on my knock sensor to see if that needs to be replaced, but should I be concerned about the other two codes, and could they be related? The 23-01 code seems to be related to the knock sensor, but what about the P0219 engine speed code? Would that be related to the knock sensor being bad? Maybe I have a bad wire or the ECM is going bad? Thanks in advance for any advice!

 
Rep Power: 133

Check for evidence of rodents under your hood. These buggers like to chew on the tasty wire insulation of the knock sensor.

 
Rep Power: 0

Just to update... I decided to go ahead and order a new knock sensor, which I will be installing later this week. Hopefully that eliminates the trouble code. I have to install a new cat manifold anyways, so I figured I'd do both at the same time. Also considering getting new O2 sensors with the new cat.

 
Rep Power: 125

I'm hoping you ordered OEM sensor(s). Aftermarket don't work very well.

 
Rep Power: 367

knock sensors are not common to replace, not sure if OE or aftermarket work better or not, to be honest

 
Rep Power: 367

the pain is that there are lots of stuff to remove before getting to the knock sensor. Not really sure if OEM is needed, but for the work, maybe getting OEM is better. Don't forget to tighten it (don't ask why i say it...)